Molecular Basis of Cellular Senescence and Anti-Aging Intervention Research
Molecular Basis of Cellular Senescence and Anti-Aging Intervention Research
With the acceleration of population aging, age-related cancers, cardiovascular diseases, neurodegenerative diseases, and metabolic abnormalities continue to increase, making the mechanisms of aging an important direction in life science and disease research. Cellular senescence is an important component of organismal aging. Senescent cells can gradually accumulate in multiple tissues and affect tissue homeostasis and the progression of age-related diseases through persistent functional alterations.
Keywords: cellular senescence; anti-aging; SASP; SA-β-Gal; Senolytic; mTOR; mitochondria; autophagy
1 Biological Characteristics of Cellular Senescence
1.1 Stable Proliferative Arrest
A core characteristic of cellular senescence is relatively stable cell-cycle exit, but it is not equivalent to any form of reduced proliferation. Quiescent cells can usually resume proliferation after nutrients and growth signals are restored; terminal differentiation belongs to a normal developmental program; and acute injury can cause temporary cell-cycle arrest. In contrast, senescent cells continue to maintain proliferative suppression after withdrawal of the stimulus and are accompanied by changes such as DNA damage responses, lysosomal expansion, metabolic remodeling, or the senescence-associated secretory phenotype (SASP). Observation of reduced Ki-67, decreased cell number, or increased p21 alone cannot independently confirm that cells have entered senescence.
1.2 Heterogeneity of Senescent Phenotypes
Replicative senescence, DNA damage-induced senescence, oncogene-induced senescence, and mitochondrial dysfunction-associated senescence do not share a completely uniform molecular-marker profile. Different models vary in their dependence on p16, p21, SASP, mitochondrial metabolism, and chromatin remodeling, and the same cell type may also display different phenotypes during senescence establishment and stable maintenance. Cellular senescence is more appropriately defined by stable proliferative arrest combined with multiple dimensions such as DNA damage, lysosomal alterations, secretory changes, or metabolic changes rather than by a single marker.
Table 1 Major Differences Between Cellular Senescence and Other Non-Proliferative States
Cellular State | Proliferative State | Recovery After Stimulus Withdrawal | Major Characteristics |
Quiescence | Temporarily reduced or stopped | Usually reversible | Reduced Ki-67, reduced metabolic activity |
Terminal differentiation | Long-term non-proliferative | Usually irreversible | Tissue-specific differentiation program |
Acute injury | Reduced proliferation | Depends on injury severity | γH2AX, p53, and p21 may increase temporarily |
Apoptosis | Proliferation terminated with cell death | Irreversible | Caspase activation, membrane phospholipid externalization |
Cellular senescence | Stable cell-cycle arrest | Usually difficult to reverse | DDR, p16/p21, SA-β-Gal, SASP, etc. |
2 Mechanisms Establishing Cellular Senescence
2.1 DNA Damage and Telomere Dysfunction
(1) Persistent DNA Damage Response
DNA double-strand breaks, replication stress, and oxidative DNA damage can activate ATM/ATR and CHK1/CHK2 signaling, promote p53 stabilization and CDKN1A/p21 expression, and restrict further entry into S phase. γH2AX and 53BP1 foci can reflect sites of DNA damage, but short-term DNA damage responses primarily indicate that cells are responding to injury. Only when damage persists and occurs together with long-term proliferative arrest and other senescence-associated phenotypes does it more strongly support a senescence-associated DNA damage response.
(2) Telomere Dysfunction
Continuous replication of normal somatic cells can gradually cause some telomeres to reach a functionally critical state. Once telomere-protective structures fail, telomeres can be recognized as persistent DNA damage, thereby activating cell-cycle inhibitory programs such as p53–p21. Telomere-driven senescence does not depend entirely on average telomere length; oxidative damage, replication barriers, and impaired local telomere-repair capacity can also generate telomere-associated damage. Telomere length and telomere functional status therefore need to be evaluated separately.
2.2 p53–p21 and p16–Rb Axes
(1) p53–p21 Axis
After p53 induces p21, p21 can inhibit CDK2 and part of CDK1 activity, maintaining Rb in a relatively hypophosphorylated state and restricting E2F-dependent transcription of DNA-replication genes. This axis frequently participates in early cell-cycle arrest following DNA damage, but p21 can also increase during reversible stress. Therefore, EdU incorporation, colony formation, and other indicators after stimulus withdrawal should be combined to determine whether the arrest has become stable.
(2) p16–Rb Axis
CDKN2A/p16 mainly maintains Rb-mediated inhibition of E2F by suppressing CDK4/6 and participates in long-term stabilization of senescence in some models. p16 and p21 do not necessarily increase simultaneously, and different cellular backgrounds may depend primarily on one of these axes. Experimental determination should therefore be based on stable cell-cycle arrest rather than requiring a fixed p16/p21 expression pattern.
3 Stabilization and Amplification of the Senescent State
3.1 Chromatin and Nuclear Structural Remodeling
Persistent DNA damage can be accompanied by decreased LMNB1, nuclear-lamina abnormalities, and chromatin reorganization, while some cells also form senescence-associated heterochromatin structures. These changes can further restrict re-expression of certain proliferation-related genes, gradually shifting early damage responses toward stable senescence. However, LMNB1 reduction or specific heterochromatin structures are not required phenotypes in all models and are more appropriately used as supplementary evidence beyond cell-cycle arrest and DNA damage.
3.2 cGAS–STING and SASP
(1) Cytosolic DNA Sensing
Nuclear-envelope instability, chromatin fragmentation, and micronuclear rupture can expose genomic DNA to the cytoplasm. Cytosolic DNA can be recognized by cGAS, thereby activating STING–TBK1–IRF3 and NF-κB-related signaling. This process connects persistent DNA damage with inflammatory programs, allowing genomic instability within the nucleus to be further converted into extracellular secretion and microenvironmental alterations.
(2) SASP Formation
SASP consists of IL-6, IL-8, CXCL family members, growth factors, chemokines, matrix-remodeling proteins, and other components. Its composition varies with cell type, inducing factor, and senescence stage. NF-κB, p38 MAPK, mTOR, and cGAS–STING networks can all participate in its regulation; therefore, increased IL-6 alone cannot represent a complete SASP.
3.3 SASP-Mediated Paracrine Effects
Persistent SASP can alter inflammatory status, matrix metabolism, and cell fate in neighboring cells and can induce paracrine senescence in some tissue environments, further expanding local senescent phenotypes. Short-term senescence responses can participate in damage limitation and tissue repair, whereas long-term accumulation of senescent cells and persistent SASP are more likely to generate chronic inflammation and tissue dysfunction.
4 Metabolic and Proteostasis Reprogramming
4.1 Mitochondrial Dysfunction
(1) Electron Transport and Oxidative Stress
Reduced efficiency of the mitochondrial electron transport chain can increase electron leakage and ROS production, further causing oxidative DNA damage, lipid peroxidation, and protein modification. ROS can act both as an inducer of senescence and as an amplifier of DNA damage and inflammatory signaling after stable senescence has been established, forming a feedback loop among mitochondrial dysfunction, oxidative stress, and senescence maintenance.
(2) Mitochondrial Quality Control
Mitochondrial fusion, fission, and mitophagy jointly determine whether abnormal mitochondria can be efficiently removed. Insufficient quality control can lead to persistent accumulation of dysfunctional mitochondria and simultaneously affect ATP production, ROS levels, and inflammatory signaling, allowing mitochondrial abnormalities to progress from simple metabolic changes to active participation in stable senescence.
4.2 mTOR–AMPK and Biosynthetic Burden
(1) Persistent mTORC1 Activation
mTORC1 integrates amino acid, growth-factor, and nutrient signals and promotes protein and lipid synthesis. After cells have exited the cell cycle, continued high mTOR-mediated biosynthetic activity can create a state of “continued growth without division,” characterized by increased cell size, elevated translational burden, and enhanced SASP. Persistent biosynthetic signaling therefore becomes an important metabolic basis for stabilization of the senescent phenotype.
(2) AMPK and Energy Restriction
AMPK senses cellular energy status and suppresses energy-intensive biosynthetic processes under energy-deficient conditions while also regulating mTOR, autophagy, and mitochondrial metabolism. The key function of the AMPK–mTOR axis is to coordinate energy supply, biosynthesis, and cellular quality control rather than simply determining whether cells enter senescence.
4.3 NAD⁺–Sirtuin and Metabolic Homeostasis
NAD⁺ participates in cellular redox reactions and also serves as an important substrate for NAD⁺-dependent enzymes such as SIRT1. Changes in NAD⁺ can affect DNA repair, mitochondrial metabolism, protein acetylation, and inflammatory regulation. Age-associated disruption of NAD⁺ metabolism can further influence cellular energy and stress homeostasis, making NAD⁺ supplementation and Sirtuin regulation important directions in metabolic anti-aging research.
4.4 Autophagy and the Lysosomal System
(1) Autophagic Flux
Autophagy removes damaged proteins and organelles through the coordinated processes of autophagosome formation, lysosomal fusion, and substrate degradation. Increased LC3-II can result from either enhanced autophagosome formation or impaired degradation, while accumulation of p62/SQSTM1 also requires interpretation in the context of flux experiments. Therefore, senescence studies should focus on the complete “formation–fusion–degradation” process.
(2) Lysosomal Expansion and SA-β-Gal
Senescent cells are often accompanied by increased lysosome number and mass, and enhanced SA-β-Gal activity is closely related to this lysosomal expansion. Non-senescent cells with high lysosomal activity can also generate background signals. Therefore, SA-β-Gal is suitable as one dimension of the senescence evidence chain but cannot replace evaluation of stable proliferative arrest, DNA damage, or SASP.
5 Cellular and Animal Models of Senescence
5.1 Replicative Senescence
Primary human fibroblasts and related cells can gradually develop stable senescence after long-term serial passaging as a result of telomere dysfunction, persistent replication stress, and metabolic alterations. This model resembles long-term replicative aging but requires an extended experimental period. Donor age, initial telomere status, culture oxygen concentration, and cell batch can all influence model progression, so cumulative population doublings generally reflect cellular replication history more accurately than culture duration alone.
5.2 DNA Damage-Induced Senescence
(1) Chemical Induction
Doxorubicin, camptothecin, bleomycin, and related compounds can generate persistent DNA damage responses through topoisomerase inhibition, DNA strand breaks, or oxidative damage. The key to establishing these models is identifying an appropriate “damage intensity–recovery time” window in which most cells remain viable after induction but cannot resume proliferation after withdrawal of the stimulus. Insufficient treatment may cause only reversible arrest, whereas excessive treatment can shift cells toward apoptosis or necrosis.
(2) Irradiation-Induced Senescence
Ionizing radiation can generate DNA double-strand breaks and persistent DNA damage responses and is suitable for studying DNA damage, SASP, and cellular senescence after tissue injury. Immediate increases in γH2AX and p21 after irradiation primarily indicate that damage has occurred. Stable senescence should be confirmed after a recovery period using proliferation, SA-β-Gal, SASP, and related indicators.
5.3 Oxidative Stress and Mitochondrial Injury Models
H₂O₂ can rapidly increase cellular oxidative stress, whereas rotenone induces mitochondrial stress by inhibiting mitochondrial complex I. These models are suitable for analyzing relationships among ROS, mitochondrial function, and DNA damage. The stimulation intensity must be carefully controlled; insufficient oxidative stress may produce a transient adaptive response, whereas excessive stress can cause cell death.
5.4 Oncogene-Induced Senescence
Persistent activation of oncogenic signals such as RAS and BRAF can induce replication stress and DNA damage and establish oncogene-induced senescence (OIS) through programs including p53–p21 and p16–Rb. OIS can restrict continued proliferation of cells carrying aberrant oncogenic signals, whereas persistent SASP can alter the tumor microenvironment. This model is therefore suitable for studying the dual roles of senescence in tumor suppression and chronic inflammation.
5.5 Animal Aging Models
(1) Natural Aging Model
Naturally aged animals preserve long-term changes in immunity, endocrine function, metabolism, and tissue microenvironments and are important systems for studying accumulation of senescent cells within tissues and age-related organ-function decline. Their major limitations include long experimental duration, substantial interindividual variation, and asynchronous aging rates and senescence-marker expression among different organs.
(2) D-Galactose Model
Continuous D-galactose loading can increase oxidative stress, glycation, and metabolic pressure and generate some aging-related tissue phenotypes. This model is suitable for oxidative-stress and intervention-mechanism studies but represents an induced aging-like model and cannot substitute for naturally aged animals when interpreting complete time-dependent aging processes.
Table 2 Experimental Positioning of Common Senescence Models
Model | Major Driving Factors | Prominent Phenotype | Suitable Research Direction |
Replicative senescence | Telomere dysfunction, long-term replication stress | Stable proliferative arrest | Telomeres and replicative lifespan |
DNA damage-induced senescence | DNA breaks, topoisomerase inhibition | Persistent DDR, p53–p21 | DNA damage and senescence |
Irradiation-induced senescence | DNA double-strand breaks | DDR, SASP | Post-injury senescence |
Oxidative stress-induced senescence | Increased ROS, mitochondrial injury | Oxidative damage, metabolic abnormalities | ROS and mitochondrial mechanisms |
Oncogene-induced senescence | Persistent activation of RAS/BRAF, etc. | OIS, SASP | Tumor suppression and microenvironment |
Natural aging | Long-term systemic aging | Accumulation of senescent cells in multiple tissues | Tissue and organismal aging |
D-galactose model | Metabolic and oxidative stress | Partial aging-like phenotypes | Oxidative stress-related aging |
6 Experimental Evaluation of Cellular Senescence
6.1 Stable Cell-Cycle Arrest
(1) EdU and Ki-67
EdU reflects DNA replication activity, while Ki-67 identifies actively proliferating cells. Reductions in both can demonstrate suppressed proliferation, but quiescence and acute stress can produce similar results. For induced models, evaluation should be repeated during the recovery period after stimulus withdrawal to determine whether cells can re-enter the cell cycle.
(2) Colony-Forming Capacity
Colony formation more directly reflects long-term proliferative potential. If cells remain viable after induction but persistently fail to form effective colonies during recovery culture, this further supports stable cell-cycle exit and helps distinguish reversible growth inhibition from true senescence.
6.2 DNA Damage and Nuclear Structure
(1) γH2AX and 53BP1
Nuclear γH2AX and 53BP1 foci are used to evaluate DNA damage sites. In senescence studies, greater attention should be paid to whether these lesions persist during the recovery period. An increase in total γH2AX shortly after induction cannot distinguish transient DNA damage from stable senescence.
(2) LMNB1
Reduced LMNB1 can reflect changes in the nuclear lamina and chromatin structure, but its alteration is model-dependent. LMNB1 is suitable as a supplementary dimension beyond stable proliferative arrest, DNA damage, and SA-β-Gal rather than as an independent marker of senescence.
6.3 SASP Evaluation
SASP evaluation should include multiple representative secreted factors such as IL-6, IL-8, and CXCL1 and, depending on the experimental purpose, combine transcriptional measurements with protein levels in culture supernatants. An increase in a single inflammatory factor cannot exclude a general inflammatory response, while increased mRNA without a corresponding change in secreted protein is also insufficient to demonstrate establishment of a complete SASP.
6.4 Mitochondrial and Redox Status
ROS, mitochondrial membrane potential, ATP, SOD, and MDA can evaluate metabolic status from the perspectives of oxidative stress, mitochondrial polarization, energy production, antioxidant capacity, and lipid peroxidation, respectively. If the goal is to demonstrate inhibition of senescence, stable proliferative arrest, SASP, or other senescence endpoints should also change accordingly; reduced ROS alone is insufficient.
6.5 Autophagy and Proteostasis
LC3B and p62 can be used to observe autophagy-related changes, but autophagic flux should be evaluated whenever possible. When LC3-II accumulation is accompanied by increased p62, impaired autophagic degradation should be considered. Lysosomal inhibition, dynamic measurements, or other flux indicators are required to distinguish autophagy activation from autophagy blockade.
6.6 Cell Death and Senescence Determination
Cell-death indicators such as Annexin V/PI can be used to exclude acute cellular injury caused by excessively strong induction conditions and can also support selectivity evaluation in Senolytic studies. Extensive apoptosis in a senescence model generally indicates excessive induction intensity. For candidate Senolytic treatment, death sensitivity should be compared between senescent cells and matched non-senescent cells to distinguish selective clearance from general cytotoxicity.
7 Levels of Anti-Aging Intervention
7.1 Inhibition of Senescence Formation
(1) Reduction of Persistent Damage
DNA damage, oxidative stress, and mitochondrial dysfunction are important upstream drivers in multiple cellular senescence models. Reducing ROS, improving mitochondrial quality control, or alleviating persistent DNA damage can reduce sustained activation of stable cell-cycle arrest programs. These interventions mainly act before or during the early phase of senescence establishment, and their evaluation should focus on whether the proportion of newly formed senescent cells, DDR, and stable cell-cycle arrest are reduced.
(2) Regulation of Metabolism and Cellular Quality Control
mTOR–AMPK, NAD⁺–Sirtuin, and autophagy jointly connect energy supply, biosynthesis, and organelle quality control. Rapamycin can reduce part of the biosynthetic burden and regulate autophagy through mTORC1 inhibition; metformin affects mitochondrial energy metabolism and AMPK-related signaling; NMN, resveratrol, and spermidine regulate cellular homeostasis through NAD⁺ metabolism, Sirtuin, or autophagy-related mechanisms, respectively. Such interventions are mainly used to reduce the tendency toward senescence formation or improve senescence-associated functional states and are not equivalent to direct clearance of senescent cells.
7.2 Senomorphic Phenotype Modulation
Senomorphic strategies act on established senescent cells by suppressing SASP, chronic inflammation, or abnormal metabolism to reduce their impact on the tissue microenvironment without requiring senescent-cell death. These studies should simultaneously evaluate SASP and related functional indicators while confirming that cell numbers and viability have not decreased because of substantial apoptosis, thereby distinguishing senescent-phenotype modulation from senescent-cell clearance.
7.3 Senolytic Selective Clearance
(1) Survival Dependencies of Senescent Cells
Senescent cells are chronically exposed to DNA damage, ROS, and metabolic stress but can remain viable through BCL-2 family proteins, PI3K–AKT, and other prosurvival networks. Senolytic strategies exploit increased dependence of senescent cells on specific anti-apoptotic or kinase networks and induce senescent-cell death by disrupting these survival dependencies.
(2) Selectivity Evaluation
Dasatinib plus Quercetin, Fisetin, Piperlongumine, and related compounds can display Senolytic or other Senotherapeutic effects in specific experimental systems, but drug sensitivity varies considerably according to cell origin, induction method, and senescence stage. Experiments must include matched non-senescent cell controls and compare cell viability, Annexin V/PI, or other death indicators. Selective clearance is supported only when senescent cells show greater death sensitivity.
8 Products Related to Cellular Senescence and Anti-Aging Research
8.1 Products Related to Senescence Model Construction
Catalog # | Product Name | Grade & Purity | Mechanism | Research Application |
D-(+)-Galactose | ≥98% | Sustained loading can increase metabolic and oxidative stress | D-galactose-related animal aging models | |
Doxorubicin (Adriamycin) HCl | 10mM in DMSO | Inhibits topoisomerase II and induces DNA damage | DNA damage-induced senescence models | |
Bleomycin Sulfate(mixture) | 1.5-2.0 units/mg | Induces DNA strand breaks and oxidative DNA damage | DNA damage- and tissue injury-related senescence research | |
(S)-(+)-Camptothecin | Analytical standard, Moligand™, ≥98% | Stabilizes Topo I–DNA complexes and induces replication-associated DNA damage | DNA damage, cell-cycle, and senescence model research | |
Rotenone | Analytical standard, ≥96%, Moligand™ | Inhibits mitochondrial complex I and increases mitochondrial stress | Mitochondrial dysfunction- and ROS-related senescence research |
8.2 Products Related to Anti-Aging and Senotherapeutic Mechanism Research
Catalog # | Product Name | Grade & Purity | Mechanism | Research Application |
Rapamycin (AY-22989) | Moligand™, 10mM in DMSO | Inhibits mTOR and regulates protein synthesis, autophagy, and SASP | mTOR-dependent senescence and Senomorphic research | |
Metformin hydrochloride | 100mM in water | Affects mitochondrial respiration and regulates AMPK-related signaling | AMPK–mTOR, energy metabolism, and senescence-intervention research | |
Resveratrol | Moligand™, ≥99% | Regulates SIRT1, autophagy, and oxidative stress-related signaling | SIRT1- and metabolic-homeostasis-related research | |
Fisetin quarterhydrate | ≥98% | Regulates multiple stress- and cell-survival-related signaling pathways | Senotherapeutic and senescent-cell selectivity research | |
Quercetin | Analytical standard, Moligand™, ≥98.5% | Regulates PI3K and other cell-survival and oxidative-stress networks | Commonly combined with Dasatinib for Senolytic research | |
Dasatinib (BMS-354825) | Moligand™, 10mM in DMSO | Inhibits Src/Abl and other tyrosine kinases | Senescent-cell survival dependency and D+Q combination research | |
Piperlongumine | 10mM in DMSO | Increases redox stress and affects cell-survival networks | Senescent-cell redox-vulnerability research | |
Spermidine | Moligand™, ≥99% | Regulates polyamine homeostasis and promotes autophagy-related processes | Autophagy, mitochondrial quality control, and longevity-mechanism research | |
β-Nicotinamide Mononucleotide (NMN) | ≥95% | Acts as an NAD⁺ biosynthetic intermediate and regulates NAD⁺ metabolism | NAD⁺, Sirtuin, and age-related metabolism research | |
Melatonin | Moligand™, ≥98% | Activates MT1/MT2 and participates in redox regulation | Oxidative stress-, mitochondrial-, and aging-related protection research | |
N-Acetyl-L-Cysteine (NAC) | Moligand™, for cell culture, ≥99% | Provides thiol reducing capacity and supports the glutathione system | Validation of ROS-dependent senescence mechanisms | |
Coenzyme Q10 | Analytical standard, ≥98% | Participates in mitochondrial electron transport and regulates oxidative stress | Mitochondrial-function and redox-state research |
8.3 Products Related to Senescence Markers and Signaling Pathway Detection
Catalog # | Product Name | Grade & Purity | Detection Target/Principle | Research Application |
Cell Senescence β-Galactosidase Staining Kit | BioReagent, for microscope | Detects senescence-associated lysosomal β-galactosidase activity | Evaluation of the SA-β-Gal senescent phenotype | |
Recombinant CDKN2A/p16INK4a Antibody | Carrier Free, Recombinant, ExactAb™, Azide Free, Validated, PBS Only, See COA | Specifically recognizes p16INK4a | Evaluation of the p16–Rb senescence-maintenance axis | |
Recombinant p53 Antibody | Recombinant, ExactAb™, Validated, 0.12 mg/mL | Specifically recognizes p53 | Evaluation of DNA damage–p53–p21 signaling | |
53BP1 Antibody | ExactAb™, Validated, 0.5 mg/mL | Detects the DNA damage-repair protein 53BP1 | Evaluation of DNA damage foci and persistent DDR | |
Lamin B1 Mouse mAb | Animal Free, Carrier Free, ExactAb™, Azide Free, Validated, High Performance, PBS Only, ≥95%(SDS-PAGE), 1.0 mg/mL | Specifically recognizes LMNB1 | Evaluation of nuclear-lamina and chromatin alterations | |
Recombinant Ki67 Antibody | Recombinant, ExactAb™, Validated, See COA | Detects the proliferation marker Ki-67 | Confirmation of proliferative arrest | |
Recombinant LC3B Antibody | Recombinant, ExactAb™, Validated, See COA | Detects LC3B and autophagosome-related changes | Autophagy-process and quality-control research | |
SQSTM1 Mouse mAb | Carrier Free, ExactAb™, Validated, High Performance, See COA | Detects p62/SQSTM1 | Evaluation of autophagic substrate turnover and proteostasis | |
Recombinant AMPK alpha 1 Antibody | Recombinant, ExactAb™, Validated, See COA | Detects AMPKα1 | Energy sensing and AMPK–mTOR signaling research | |
Recombinant Phospho-mTOR (S2481) Antibody | KD Validation | Detects phosphorylated mTOR (S2481) | Evaluation of mTOR activation status | |
BDNF Antibody | ExactAb™, Validated, 1.0 mg/mL | Detects BDNF protein | Research on BDNF-related senescent-cell survival signaling | |
Mouse Interleukin 6 (IL-6) ELISA Kit | BioReagent | Quantitative detection of mouse IL-6 | Evaluation of SASP and inflammatory secretory phenotypes | |
Rat Sirtuin 1 (SIRT1) ELISA Kit | BioReagent | Quantitative detection of rat SIRT1 | NAD⁺–SIRT1-related metabolic research |
8.4 Products for Evaluation of Mitochondria, Oxidative Stress, and Cell Death
Catalog # | Product Name | Grade & Purity | Detection Principle | Research Application |
Reactive Oxygen Species Assay Kit |
| Reflects intracellular ROS changes through ROS-sensitive fluorescent probes | Evaluation of cellular ROS levels and oxidative stress | |
Mitochondrial Membrane Potential Detection Kit (JC-1) |
| JC-1 aggregation state changes with mitochondrial membrane potential | Evaluation of mitochondrial polarization and function | |
ATP Content Assay Kit (NADPH Rate, UV Micro Method) | BioReagent | Quantifies ATP through changes in NADPH in a coupled reaction | Evaluation of cellular energy-metabolism status | |
Total Superoxide Dismutase (SOD) Assay Kit (NBT Riboflavin Colorimetric Method) | BioReagent | Measures total SOD activity based on inhibition of NBT photoreduction | Evaluation of antioxidant capacity in cells and tissues | |
Lipid Peroxidation (MDA) Assay Kit | sufficient for 100colorimetricorfluorometrictests | Detects the lipid-peroxidation product MDA | Evaluation of lipid peroxidation and oxidative injury | |
Annexin V-FITC/PI Apoptosis Detection Kit | Suitable for Immunofluorescence (IF), BioReagent, Biological Stain, for microscopy | Annexin V detects phosphatidylserine externalization, while PI reflects plasma membrane integrity | Discrimination of Senolytic selectivity, apoptosis, and general cytotoxicity |
Cellular senescence is fundamentally a complex state maintained jointly by persistent DNA damage, cell-cycle arrest, metabolic reprogramming, proteostasis imbalance, and SASP, and its establishment and maintenance are regulated by multiple pathways including p53–p21, p16–Rb, mTOR–AMPK, cGAS–STING, and mitochondrial homeostasis. Current anti-aging research has progressed from simply delaying senescent phenotypes toward distinct intervention levels including inhibition of senescence formation, Senomorphic phenotype modulation, and Senolytic selective clearance, providing clearer experimental directions for studying aging mechanisms and age-related diseases.
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